Expressions for AE

// Apply to Time Remap
a = thisComp.layer("midi").effect("ch_0_dur")("Slider");
n = 0;
if (a.numKeys > 0) {
    n = a.nearestKey(time).index;
    if (a.key(n).time > time) n--;
}
n > 0 ? time - a.key(n).time : 0



// Apply to Scale Width on Transform effect
a = thisComp.layer("midi").effect("ch_0_dur")("Slider");
n = 0;
if (a.numKeys > 0) {
    n = a.nearestKey(time).index;
    if (a.key(n).time > time) n--;
}
n % 2 != 0 ? 100 : -100